Today Hong Kong's Centre for Health Protection (CHP) noted a second case of human avian influenza A(H5N1) from Cambodia in a 14-year-old girl who is hospitalized for her infection. The girl is from Takeo province, and no background information on her illness or exposure has been provided.
Last week, a 3-year-old girl from Kampong Speu province was receiving intensive care for her H5N1 infection. A statement from the Cambodia Ministry of Health said birds in the patient's home and in neighboring houses had been sick and dying for roughly a week when the child became ill.
The latest human cases in Cambodia have involved a reassortant (2.3.2.1e) between an older H5N1 clade that has circulated in Cambodia since 2014 and the newer clade 2.3.4.4b virus that is circulating globally. The recent cases bring the total number of human H5N1 cases in Cambodia this year to 17.
Also in this week's update from the CHP, officials note four H9N2 cases in mainland China that were retrospectively recorded. The cases include a person in Guangdong province who had illness onset in February 2025. In that same month two ill people in Guangxi Zhuang Autonomous region were also reported, as was one case-patient in Tianjin municipality.
In 2025 there have been 25 H9N2 cases reported from mainland China. In 2024, the country reported 11 total cases.
Idaho reports backyard poultry outbreak
In US avian flu news, Idaho has reported a new backyard poultry H5N1 outbreak in 90 birds in Canyon County, according to the latest update from the US Department of Agriculture's Animal and Plant Health Inspection Service (APHIS).
In the past 30 days, APHIS said there have been 53 confirmed flocks with highly pathogenic avian influenza in commercial and backyard flocks in the United States, with 6.37 million birds affected during that period.
